Comparing data from VLA sky surveys made some two decades apart revealed that the black hole-powered ‘engines’ at the cores of some distant galaxies have launched new, superfast jets of material during the interval between the surveys.
Astronomers using data from the ongoing VLA Sky Survey (VLASS) have found a number of distant galaxies with supermassive black holes at their cores that have launched powerful, radio-emitting jets of material within the past two decades or so. The scientists compared data from VLASS with data from an earlier survey that also used the National Science Foundation’s Karl G. Jansky Very Large Array (VLA) to reach their conclusion.
“We found galaxies that showed no evidence of jets before but now show clear indicati...
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